1.  13, 14, 27, 45, 68, 109, 177
A. 27
B. 109
C. 45
D. 68

Answer: Option C

Explanation:

13 + 14 = 27
14 + 27 = 41
27 + 41 = 68
41 + 68 = 109
68 + 109 = 117
So, 45 is the wrong number in this series.